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Acute PainBOLPAPNCT05819476

Boosting Open-Label Placebo Effects in Acute Induced Pain in Healthy Adults

A study testing OLP-injection, Scripted Evidence-based treatment rationale and Experimental model of acute pain in people with Acute Pain, run by University Hospital, Basel, Switzerland at 1 site in Switzerland.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This study is to investigate the effect of open-label placebo (OLP) application on acute pain in an experimental model of acute pain (simulating wound pain: this installation will apply monophasic, rectangular electrical pulses of 0.5ms duration with alternating polarity at 2 Hz frequency. Read more about this study

Who is it for?
Ages 18 to 65 yearsHealthy volunteers can take part
Conditions the study is for
Acute Pain
What is being tested?
OLP-injection, Scripted Evidence-based treatment rationale and Experimental model of acute pain
Could I receive a placebo?
No, everyone receives an active treatment
How many people
141 participants
Where
1 siteSwitzerland
Study dates
23 Mar 2023to Jun 2025
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Healthy volunteers (ASA Class I or II), aged 18 to 65 years
  • BMI between 18 and 25kg/m2
  • Able to understand the study and the NRS
  • Able to give informed consent

Who cannot join

  • Participation in a previous open-label placebo study; for Part 2, this includes Part 1 of this study
  • Regular intake of medications or drugs potentially interfering with pain sensation (analgesics, opioids, antihistamines, calcium and potassium channel blockers, serotonin/ noradrenaline reuptake inhibitors, corticosteroids)
  • Neuropathy
  • Chronic pain
  • Neuromuscular disease
  • Dermatological disease (i.e. Atopic Dermatitis)
  • Psychiatric disease
  • Pregnancy / Lactation

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Tobias Schneider, MD contact

+41 61 328 65 43

tobias.schneider@usb.ch

Switzerland1 site, 1 recruiting
  • University Hospital of Basel (USB); Department of Anaesthesiology

    Basel, 4031

    Tobias Schneider, MD, +41 61 328 65 43, tobias.schneider@usb.ch

    Tobias Schneider, MD

    Recruiting

Other trials in Switzerland

About this study

This study is to investigate the effect of open-label placebo (OLP) application on acute pain in an experimental model of acute pain (simulating wound pain: this installation will apply monophasic, rectangular electrical pulses of 0.5ms duration with alternating polarity at 2 Hz frequency. The current will be increased to target a pain rating of 6 of 10 on the NRS (0 = no pain, 10 = worst imaginable pain). Three further adjustments in current will be made every 5 minutes for the next 15 minutes to compensate for habituation. This final current will be kept constant until the end of the particular experiment).

In Part 1 duration of OLP analgesia will be examined, and onset and size of the effect will be reevaluated.

In Part 2 of this study outcomes between subjects receiving one OLP injection, subjects receiving one repetition of the injection on a fixed time point and subjects receiving one repetition of the injection on-demand will be evaluated

Read the detailed description

Pain is highly prevalent in hospital settings. Standard systemic treatment for acute pain consists mainly of basic analgesia. The use of these drugs is often restricted due to their contraindications. Placebo is used nowadays to describe sham treatments and "inert" substances like sugar pills and saline injections. Placebos are proven to elicit clinically significant effects in various conditions, including pain. Ethical concerns about the use of deceptive placebos have prevented their implementation in clinical practice. A possibility to address this issue would be to prescribe placebos openly, that means, without deception. This randomized crossover study evaluates the efficacy of open-label placebo (OLP) in acute pain. Subjective pain ratings and areas of hyperalgesia and allodynia will be measured in a well-established experimental pain model (intradermal electrical stimulation model evoking pain: this installation will apply monophasic, rectangular electrical pulses of 0.5ms duration with alternating polarity at 2 Hz frequency. The current will be increased to target a pain rating of 6 of 10 on the NRS (0 = no pain, 10 = worst imaginable pain). Three further adjustments in current will be made every 5 minutes for the next 15 minutes to compensate for habituation. This final current will be kept constant until the end of the particular experiment) and analgesia elicited by OLP injections will be investigated.

In Part 1 duration of OLP analgesia will be examined, and onset and size of the effect will be reevaluated.

In Part 2 of this study outcomes between subjects receiving one OLP injection, subjects receiving one repetition of the injection on a fixed time point and subjects receiving one repetition of the injection on-demand will be evaluated (which leaves the last group a choice over when they would like to have the placebo "booster").

Conditions
Acute Pain
Being tested
OLP-injection, Scripted Evidence-based treatment rationale, Experimental model of acute pain
Keywords
Open-Label Placebo (OLP), OLP analgesia, acute pain, hyperalgesia, allodynia
Medical subject headings
Acute Pain, Hyperalgesia

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • OLP-injectionProcedure or surgery

    Open-label placebo injections without any active ingredient (5 ml 0.9% saline). All participants will be informed that the administered injections are placebo infusions.

  • Scripted Evidence-based treatment rationaleOther

    As a second component the intervention will consist of an evidence-based treatment rationale, which will be delivered to patients receiving the intervention prior to the OLP-injections, explaining placebo analgesia in pain in general and specifically in OLP. In the context of OLP treatments this rationale is important in order to create a mental state of positive expectations.

  • Experimental model of acute painOther

    Experimental model of acute pain (simulating wound pain: this installation will apply monophasic, rectangular electrical pulses of 0.5ms duration with alternating polarity at 2 Hz frequency. The current will be increased to target a pain rating of 6 of 10 on the NRS (0 = no pain, 10 = worst imaginable pain). Three further adjustments in current will be made every 5 minutes for the next 15 minutes to compensate for habituation. This final current will be kept constant until the end of the particular experiment).

Study groups in NCT05819476
Study groupRoleWhat they receive
Part 1: Visit 1 (No treatment) followed by Visit 2 (OLP intervention)OtherIn Part 1, participants will receive one injection (administration of open-label placebo injections without any active ingredient (5 ml 0.9% saline)) at twenty minutes after start of the experiment during the intervention visit 2. Visit 1 (No treatment) will be the control of the study intervention.
Receives: Procedure: OLP-injection; Other: Scripted Evidence-based treatment rationale; Other: Experimental model of acute pain
Part 1: Visit 1 (OLP intervention) followed by Visit 2 (No treatment)OtherIn Part 1, participants will receive one injection (administration of open-label placebo injections without any active ingredient (5 ml 0.9% saline)) at twenty minutes after start of the experiment during the intervention visit 1. Visit 2 (No treatment) will be the control of the study intervention.
Receives: Procedure: OLP-injection; Other: Scripted Evidence-based treatment rationale; Other: Experimental model of acute pain
Part 2/ Group A: 1x OLP (Control)OtherIn Part 2, the Group A (Control) receives just one single OLP injection and no repetition.
Receives: Procedure: OLP-injection; Other: Scripted Evidence-based treatment rationale; Other: Experimental model of acute pain
Part 2/ Group B: 2x OLP; booster time fixedOtherIn Part 2, Group B participants will receive two injections, the first at twenty minutes after start of the experiment, and the second at a time point derived from Part 1 (if data is inconclusive; at 100 minutes). For every subsequent OLP administration, patients will be reminded of the inertness of the injection and that this injection might help with regulating pain.
Receives: Procedure: OLP-injection; Other: Scripted Evidence-based treatment rationale; Other: Experimental model of acute pain
Part 2/ Group C: 2x OLP; booster on- demandOtherIn Part 2, Group C participants will receive two injections, the first at twenty minutes after start of the experiment, and the second on demand. For every subsequent OLP administration, patients will be reminded of the inertness of the injection and that this injection might help with regulating pain.
Receives: Procedure: OLP-injection; Other: Scripted Evidence-based treatment rationale; Other: Experimental model of acute pain

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Part 1: Change in Area under the Pain Curve (AUPC)

    Area under the Pain Curve (AUPC) using the numeric rating scale (NRS; 0 = no pain, 10 = worst imaginable pain) during three hours after administering an OLP

    Measured: During three hours after administering an OLP

  2. Part 2: Change in Area under the Pain Curve (AUPC)

    Area under the Pain Curve (AUPC) using the numeric rating scale (NRS; 0 = no pain, 10 = worst imaginable pain). Comparison of the AUPCs of subjects receiving just one OLP injection with subjects additionally receiving one repetition of OLP administration at a time point derived from Part 1 and subjects getting the second OLP injection on-demand.

    Measured: During three hours after administering an OLP

Secondary outcomes (3)
  1. Part 1 and 2: Change in subjective pain ratings on each measurement point using the numeric rating scale (NRS)

    Change in subjective pain ratings on each measurement point using the numeric rating scale (NRS); NRS; 0 = no pain, 10 = worst imaginable pain) every five minutes after OLP administration)

    Measured: Up to 200 minutes after electrical pain stimulation

  2. Part 1 and 2: Change in Area under the Curve (AUC) of area of hyperalgesia

    Change in Area under the Curve (AUC) of area of hyperalgesia comparing the intervention and control (no treatment) visit. Pinprick hyperalgesia will be assessed every 10 minutes after OLP administration) using a 600 millinewton (mN) von Frey filament.

    Measured: Up to 200 minutes after electrical pain stimulation

  3. Part 1 and 2: Change in Area under the Curve (AUC) of area of allodynia

    Change in Area under the Curve (AUC) of area of allodynia comparing the intervention and control (no treatment) visit. Allodynia will be determined using a dry cotton swab every 10 minutes after OLP administration).

    Measured: Up to 200 minutes after electrical pain stimulation

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted19 Apr 2023
  2. Study start23 Mar 2023
  3. Primary completionJun 2025 (estimated)
  4. Study completionJun 2025 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Other
Allocation
Randomised
Intervention model
Crossover
Model description
The first part of this study is designed as a confirmatory, randomized, two-arm, assessor-blinded cross-over trial in a monocentric setup at the University Hospital of Basel. The second part is designed as a proof-of-concept, randomized, controlled, three-arm trial in a monocentric setup at the University Hospital of Basel.
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
141 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05819476
Sponsor's protocol ID
2023-00296; am23Schneider
Other IDs
2023
Acronym
BOLPAP
Status last verified
Jan 2025
First submitted
20 Mar 2023
Last updated
24 Jan 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Publications

  • de Leeuw M, Laager M, Gaab J, Ruppen W, Schneider T. Boosting open-label placebo effects in acute induced pain in healthy adults (BOLPAP-study): study protocol of a randomized controlled trial. Front Med (Lausanne). 2024 Feb 14;11:1238878. doi: 10.3389/fmed.2024.1238878. eCollection 2024.

    PubMed 38420356

Questions about this trial

What is this clinical trial studying?

A study testing OLP-injection, Scripted Evidence-based treatment rationale and Experimental model of acute pain in people with Acute Pain, run by University Hospital, Basel, Switzerland at 1 site in Switzerland.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 24 Jan 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Switzerland. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Tobias Schneider, MD (+41 61 328 65 43, tobias.schneider@usb.ch), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Part 1: Change in Area under the Pain Curve (AUPC) (time frame: During three hours after administering an OLP). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05819476, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Jan 2025.

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